Quote:
Originally Posted by DavGoodlin
Great job Tim. I agree that coil issue was perplexing, since shorting that coil is S.O.P. on CTC12 and later chassis to center the hold control range. Not so on the CTC11, this coil is center-tapped - an auto-transformer to feedback from plate to the osc grid, so you don't short it because of how critical this loop is. The adjustment is in the Sams 550-2, page 16 and requires a scope to match amplitude of the two peaks.
I would not mind putting that coil on two of my ring-testers to see if that fails the coil against a good one from my working '11, the resistance measurements sure didnt 
Is that CRT a 21FJP22, or has it a formed safety glass for the 21FBP22? I covered it up and did not peek so I wasn't tempted to keep it  |
is it the sine coil or the horz freq coil that was the issue. the labled sine coil does not have a center tap. Which one is the horz hold anyway, from the attached schematic there is a sine coil (no tap) labled horz hold and then there is the taped "horz freq" labled coil. IIRC the tapped one is the horz hold control mounted for user access and the sine is not, just mounted on the pcb.
hmm looked at again, I just must be mis rembering, sure looks like the sine labled coil is off pcb and is indeed the horz hold control.
Just checked the manual, I see there were changes in how those coils were used.